Grep MCP Server

Grep MCP Server

A Model Context Protocol (MCP) server that provides powerful text search capabilities using the grep command-line utility. This server allows you to search for patterns in files and directories using both natural language descriptions and direct regex patterns.

Features

🧠 Natural Language Search

• Describe what you're looking for in plain English
• Automatic conversion to appropriate regex patterns
• Built-in patterns for common searches (emails, URLs, phone numbers, etc.)

🔍 Advanced Search Capabilities

• Direct regex pattern matching
• Recursive directory searching
• File extension filtering
• Case-sensitive/insensitive search
• Whole word matching
• Context line display
• Match counting
• File listing with matches

🛡️ Security First

• Safe command execution using child_process.spawn
• Input validation with Zod schemas
• No shell injection vulnerabilities
• Path validation and sanitization

Installation

Available Tools

1. grep_search_intent

Search using natural language descriptions.

Parameters:

• intent (string): Plain English description (e.g., "email addresses", "TODO comments")
• target (string): File or directory path to search
• case_sensitive (boolean, optional): Case-sensitive search (default: false)
• max_results (number, optional): Limit number of results
• show_context (boolean, optional): Show surrounding lines (default: false)
• context_lines (number, optional): Number of context lines (default: 2)

Example:

2. grep_regex

Search using direct regex patterns.

Parameters:

• pattern (string): Regular expression pattern
• target (string): File or directory path to search
• case_sensitive (boolean, optional): Case-sensitive search
• whole_words (boolean, optional): Match whole words only
• invert_match (boolean, optional): Show non-matching lines
• max_results (number, optional): Limit results
• show_context (boolean, optional): Show context lines
• context_lines (number, optional): Context line count
• file_extensions (array, optional): Filter by file extensions

Example:

3. grep_count

Count matches for a pattern.

Parameters:

• pattern (string): Pattern to count
• target (string): Search target
• case_sensitive (boolean, optional): Case sensitivity
• whole_words (boolean, optional): Whole word matching
• by_file (boolean, optional): Show count per file
• file_extensions (array, optional): File extension filter

4. grep_files_with_matches

List files containing the pattern.

Parameters:

• pattern (string): Search pattern
• target (string): Directory to search
• case_sensitive (boolean, optional): Case sensitivity
• whole_words (boolean, optional): Whole word matching
• file_extensions (array, optional): File extensions to include
• exclude_patterns (array, optional): File patterns to exclude

5. grep_advanced

Execute grep with custom arguments (advanced users).

Parameters:

• args (array): Array of grep arguments (excluding 'grep' itself)

Built-in Natural Language Patterns

The server recognizes these natural language intents:

Communication

• "email", "email address", "emails" → Email address pattern
• "url", "urls", "website", "link", "links" → URL pattern
• "phone", "phone number", "phone numbers" → Phone number pattern

Network

• "ip", "ip address", "ip addresses" → IPv4 address pattern

Data Types

• "number", "numbers", "integer", "integers" → Numeric patterns
• "date", "dates" → Date patterns

Code Patterns

• "function", "functions" → Function declarations
• "class", "classes" → Class definitions
• "import", "imports" → Import statements
• "export", "exports" → Export statements
• "comment", "comments" → Comment lines
• "todo", "todos" → TODO/FIXME/HACK comments

Error Patterns

• "error", "errors" → Error messages
• "warning", "warnings" → Warning messages

Usage Examples

Search for email addresses in a project

Find all TODO comments

Search for function definitions with regex

Count occurrences of a word

List files containing import statements

Development

Build and Run

Project Structure

MCP Integration

This server implements the Model Context Protocol and can be used with any MCP-compatible client.

Server Configuration

Add to your MCP client configuration:

Security Notes

• Uses spawn with shell: false to prevent command injection
• Validates all file paths before execution
• Blocks potentially dangerous grep flags in advanced mode
• Input validation with Zod schemas
• No access to system files outside specified targets